Signal whistle



1929- c. WAINWRIGHT 1,723,902

SIGNAL WHISTLE Filed Aug. 25, 1928 l lA/VENTOR ltt Patented Aug. 6,1929.

CHARLES WAINWRIGHT, 0F ERIE, PENNSYLVANIA.

SIGNAL WHISTLE.

Application filed August 25, 1928.

The object of my present invention is the provision of a simple,durable, easily aplied and removable, and reliable whistle, designedmore particularly for use 1n conjunction with inter-coolers of aircompressors or after-coolers attached to air compressors orair-receiving tanks attached to compressors, and'calculated when thetemperature for any reason reaches a predetermined point to sound analarm and put the engineer on notice to the effect that the apparatusrequires correction.

To the attainment of the foregoing, the invention consists in theimprovement as hereinafter described and definitely claimed.

In the accompanying drawing forming part hereof:

l igure 1 is a side elevation of my novel alarm whistle.

Figure 2 is a projected View of the same.

Figure 3 is a view showingthe whistle in longitudinal diametricalsection as properly arranged relatively to a wall of the apparatus thatis equipped with the whlstle.

Similar numerals of reference designate corresponding parts in all ofthe views of the drawing.

The wall 1 may of course be part of any apparatus to which the novelwhistle is applicable.

Among other elements the whistle comprises a tubular body 2, threaded atits inner end, as indicated by 3. and connected at such end to a tubularholder 4 in which is a seat or abutment 5 for a fusible plug 6, the saidplug 6 being interposed between .the inner end of the body 2 and theabutment 5 and being thereby securely held in position so as to normallysegregate the bores of the body 2 and plug holder l. At an intermediatepoint of its length the body 2 is enlarged and threaded as indicated by7, this threaded portion 7 being tapered 1nwardly so as to assure thebody being held fast and tight in a correspondingly threaded opening inthe wall 1.

The outer end portion 8 of the body 2 is further enlarged, and in saidend portion 8 is provided a chamber or recess 9 from which extendsinwardly a threaded bore 10. In addition to the elements enumerated thealarm whistle includes a stem 11, a bell 12, and a retaining nut 13. Thestem llhas its outer end portion threaded as indicated Serial No.302,154.

der pressure to operate against the bell 12.

In the practical use of the alarm whistle it will be manifest that whenthe temperature in the'device to which the Whistle is applied reaches apredetermined point the plug 6 will be fused so as to allow the pressureto escape to the eduction space or opening 18 where it Wlll bedischarged against the bell 12 and thereby make a very loud and shrillwhistle calculated to adequately warn the engineer of the apparatus thatsomething is wrong and requires prompt correction.

As appears in Figure l the body portion 8 isby preference of angularform in cross section and from this it follows that the body 2 may beexpeditiously and easily removed from the wall 1, whereupon, the holder4 may be detached from the body 2 for the ready removal of the remnantsof the fused plug and the placing of a fresh plug in the holder 4:,whereupon the device may as readily be replaced in working position,

The practical merit of my novel device will be better appreciated whenit is stated that in the event of a discharge valve in the dischargechamber of a-cylinder breaking a rise in the temperature of thedischarge air will be brought about and the temperature might be raisedto a danger point and ignite or flash the lubricating oil of thecylinder. lVit-h the use of my novel device ample warning will be givento an attendant in charge of an air compressor before the excessivelyhigh temperature of the air is reached so that the said attendant cantake the proper steps to avert an accident.

The wall 1 in the present embodiment of the invention-represents a wallof the discharge chamber of an air compressor or an air receiver or aconduit between the receiver and the discharge chamber of the cylinderor an after-cooler used in connection with the discharge chamber of thecylinder.

Having described the invention 'what is claimed is:

1. In an alarm Whistle, a tubular body having an inner end exteriorlythreaded portion, an intermediate exteriorly threaded and inwardlytapered portion and an outer enlarged portion, and also having a recessin the outer end portion and a threaded bore extending inwardlytherefrom, a tubular holder threaded on the inner end portion of thebody and having an intermediate interior abutment, and a fusible plugarranged in the holder between the inner end of the body and the holderabutment.

.2. In an alarm Whistle, a tubular body having an inner end exteriorlythreaded portion, an intermediate exteriorly'threaded and inwardlytapered portion, and an outer enlarged end portion, and also having arecess in the outer end portion and a threaded bore extending inwardlytherefrom, a tubular holder threaded on the inner end portion of thebody and having an intermediate interior abutment, and a fusible plugarranged in the holder between the inner end of the body and the holderabutment, in combination with a stem having an inner enlarged exteriorlythreaded portion socketed in the threaded bore and resting in the recessin said outer end portion of the body and having a bore open at itsinner end and also having a lateral vent leading from said bore to saidrecess.

3. In an alarm Whistle, a tubular body having a concentrically arrangedrecess at one end, a stem secured within the body and disposed axiallyfrom and within the recess and spaced from the walls of the latter toprovide an eduction space, said stein having a socket at its inner endwhich provides a continuation of the bore of the tubular body and havingopenings providing connuunication between the socket and eduction space,a bell mounted upon the outer end of the stem with the open end of thebell spaced from the body and in axial alignment with the socket, and afusible plug to control the passage of fluid through the tubular body.

In testimony whereof I afiix my signature.

CHARLES WAINWRIGHT.

